Catalysis Letters

, Volume 125, Issue 3–4, pp 229–235 | Cite as

Spatially-Resolved Calorimetry: Using IR Thermography to Measure Temperature and Trapped NOX Distributions on a NOX Adsorber Catalyst

  • Khurram Aftab
  • Jasdeep Mandur
  • Hector Budman
  • Neal W. Currier
  • Aleksey Yezerets
  • William S. Epling
Article

Abstract

Spatial- and time-resolved temperature distributions over a Pt/Ba/Al2O3 model NOX storage/reduction (NSR) catalyst were measured using infra-red thermography. The heat generated during regeneration was correlated to surface nitrate reduction, thereby revealing the concentration of surface nitrates at specific locations along the catalyst. The results demonstrate that there is more nitrate formation at upstream positions relative to downstream, or from front to back of the catalyst, with short trapping times. However, as more NOX was trapped on the catalyst during longer trapping times, it was found that the largest amount of NOX was trapped slightly downstream of the inlet, evolving to a local maximum in amount trapped. Applying infrared (IR) thermography to this system resulted in a spatially resolved calorimetry method via the correlation of temperature to the distribution of sorbed nitrate species along the catalyst.

Keywords

NOX storage NOX reduction Lean NOX traps Infra-red thermography Vehicle emissions Spatially resolved calorimetry 

Notes

Acknowledgements

The authors would like to thank the Natural Sciences and Engineering Research Council of Canada and Cummins Inc. for funding of this work. We would also like to thank Johnson Matthey for supplying the samples used in this study.

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Copyright information

© Springer Science+Business Media, LLC 2008

Authors and Affiliations

  • Khurram Aftab
    • 1
  • Jasdeep Mandur
    • 1
  • Hector Budman
    • 1
  • Neal W. Currier
    • 2
  • Aleksey Yezerets
    • 2
  • William S. Epling
    • 1
  1. 1.Department of Chemical EngineeringUniversity of WaterlooWaterlooCanada
  2. 2.Cummins Inc., MC 50321ColumbusUSA

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